CN1254332C - Method to shear strip during casting step - Google Patents
Method to shear strip during casting step Download PDFInfo
- Publication number
- CN1254332C CN1254332C CN02800875.8A CN02800875A CN1254332C CN 1254332 C CN1254332 C CN 1254332C CN 02800875 A CN02800875 A CN 02800875A CN 1254332 C CN1254332 C CN 1254332C
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- CN
- China
- Prior art keywords
- casting
- band
- speed
- under
- thickness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/126—Accessories for subsequent treating or working cast stock in situ for cutting
Abstract
Method to shear a strip (15) during the casting step, wherein the casting speed is increased, with respect to a speed of a stationary regime, maintaining the thickness of said cast strip (15) constant to the value corresponding to the speed of a stationary regime, in order to determine the formation of a liquid core (16) which determines the re-melting of the adjacent skin and the breakage of the strip (15) due to the weight of the part of the strip (15) located under the liquid core (16).
Description
Technical field
The present invention relates to when the continuous casting liquid metal, shear the method for casting band.
The present invention can be used for taking except that the front end rigion that requires length from the casting that the continuous casting machine with two rollers is discharged, and perhaps removes the tail end section of stage casting in the end when the fast end of casting.
The present invention also can be used for any stage in the casting, for example under emergency situations, in discharging casting machine, interrupt casting band before the liquid metal neatly, or the separately production of two casting bands of different-thickness, or the reason owing to production requires separately band section when casting machine is worked under stable condition.
More properly, the present invention relates to a kind of cutting method, can be in casting the band of the casting band that separately requires of any stage, and need not use mechanical device or be the special accessory part that is provided with of this operation.
The present invention especially but be not to be used for roll shape continuous casting machine (band extruder) uniquely.
Technical background
The beginning section of the known casting band of producing in non-stable condition has irregular planform, makes the casting band be difficult to enter the pinch roll or the milling train of conditional opening.
In addition, see that from productive viewpoint the quality of irregular structure part is unacceptable.
The decline of casting band also is to produce under astable condition, and its quality also is unacceptable.
Solution to this problem is in the downstream of next-door neighbour's continuous casting machine with in the upstream of the first milling train group shear to be set, and the front end rigion that requires length is removed.
But especially for steel, this scheme all has problem and can not use in technology and operation.In fact, environment in the continuous casting machine downstream is very important, special downstream at casting roll, the casting band will pass enclosed environment under the inert gas, high temperature, this temperature is 700-1000 ℃ concerning steel, to prevent to cast the surface oxidation of band, be difficult in the equipment and their operation that are provided with and control like this as cutter and so on.
Even also may require to interrupt the casting band in when casting in the interstage of casting, for example under emergency situations, maybe to separate the band of different-thickness, or under stable condition, band is divided into multistage during casting.
US-A-5690163 and US-A-5287912 disclose the method for shear band in the casting step, comprise the distance that increases in short-term between the casting roll, keep casting speed constant, the described distance that increases is followed the distance of recovering between the casting roll under the steady working condition afterwards.Increased the thickness of casting band like this, kept same casting speed, and therefore kept same time of contact between the roller of casting band and cooling, this has just determined to sandwich liquid metal between two thickness on the top layer of solidifying.This liquid metal that sandwiches makes the downstream at contact point, and two surfaces are melted and the casting band is ruptured under its gravity effect.
The applicant design and specialized the present invention with the shortcoming that overcomes prior art with obtain other advantage described below.
Summary of the invention
The purpose of this invention is to provide and a kind ofly special device need not be set and shear the method for casting band in cast sections.
For realizing above-mentioned purpose of the present invention, the invention provides a kind of method of when the casting band is discharged, shearing the casting band from continuous casting machine, described casting machine comprises at least one pair of casting roll, with comprise the cooling device at least that described band is solidified, it is characterized in that described method comprises that corresponding basicly stable speed increases casting speed, under the casting speed that increases, keep a period of time (at interval), described increase casting speed be the thickness that keeps described casting band basicly stable with stable speed corresponding thickness value under carry out, so that at least in the section of passing through described cooling device with the speed that increases, the core of the liquid metal part that formation sandwiches in described casting band, described liquid metal partly make the top layer that is close to it at least melt and disconnect owing to the weight that is positioned at the following casting band portion of described liquid metal part makes to be with.
Or rather, the present invention's suggestion is in basic natural mode, by the variation of casting speed and cause casting band thus and the cooling surface of casting roll between the variation of time of contact, keep the thickness of casting band the same with the corresponding value of the speed of under stable operating mode, using, the effect of the solidification change by the liquid metal between casting roll, the casting band that requires length is separated, or when stationary mode is cast, be with two sections requiring a separation in casting.
Under the same situation of the gross thickness of the casting band that the distance by casting roll limits, change casting speed, owing to make the cooling surface of casting roll and correspondingly change the time of contact between the liquid metal, and make the heat exchange condition and solidifying of casting band changed.
The thickness that solidifies the top layer that forms when the cooling surface of liquid metal by casting roll and the exponential function of casting speed are inversely proportional to, and concerning steel, this index is less than 1.As long as the cooling condition of casting roll is identical, reducing of top layer concreting thickness determined in the increase of casting speed, and the increase that reduces to have determined the top layer concreting thickness of casting speed.
When casting the continuous casting of band, preferably, be set in minimum distance between two casting rolls (be also referred to as contact point-i.e. the two top layer contact points that solidify) and finish with two casting rolls.
According to method of the present invention, solidify end point and be displaced to and be lower than " contact point ", the normal casting speed of absolute presupposition increases casting speed momently, and keep between the casting roll distance with the corresponding distance of this casting speed.After during this period of time, in first embodiment of the invention, after the stop short time, casting speed turns back to initial value substantially under gathering way.
According to first modification, before speed increases, there is a decelerating phase, the not corresponding rotating speed that increases casting roll excessively of speed that makes this increase, back one situation can make the power of electric motor of rotating casting roll too high.
Preferably this decelerating phase follows the casting tape thickness to increase accordingly, and this is reached by the distance that increases between the casting roll, so that keep heat exchange conditional stability, therefore makes the solidification-stable on casting band top layer; This makes and can prevent from this case to cast solidifying too early of band owing to reduce by the speed between the casting roll and make.
When casting speed increases momently, obtain at contact point and solidify the liquid metal part that sandwiches between the end point, after casting speed is returned original value, remain on casting band the inside.
These liquid metal some effects are cast vertical section of band, and in the downstream of casting roll, this liquid metal partly makes the top layer of solidifying be heated to the temperature that melts near more again.
Therefore the vertically section of casting band has relatively poor mechanical performance, makes it not support and is positioned at following casting band portion.This should section rupture the casting band mutually, therefore requires the section of length to remove naturally and neatly.
By adjusting the moment that casting speed increases, can set the position of shearing.
The time that keeps under the casting speed that increases is selected to and can guarantees to disconnect safely the casting band; It is decided by a plurality of parameters: as the length and the weight of the thickness of casting band, cooling parameter, type of material, the section that will remove.
For steel, under the most general situation, the time under gathering way is about 0-200ms, and the acceleration time is about 50-600ms, this is enough for setting up a liquid metal district in the inside of casting band, and this liquid metal district allows the casting band to disconnect at its front end rigion.
In another embodiment of the present invention, produce the liquid metal district and after increasing casting speed, casting speed is remained on the velocity amplitude of this increase in the downstream of contact point.Under this situation, one when after forming the liquid metal district that sandwiches under the situation of constant casting tape thickness, by reducing the distance between casting roll, the gross thickness of casting band reduced, keep the heat exchange condition, also keep the solidification-stable and the situation that is similar to stable operating mode on casting band top layer.
Brief description of drawings
By can understanding that to explanation these characteristics of the present invention have advantage with reference to the accompanying drawings, in the accompanying drawing as the preferred embodiment of the present invention of limiting examples:
Fig. 1 is to use the schematic diagram of the casting machine that has roller of the inventive method;
Fig. 2 a-2d is illustrated in the curve map of the variation of the relative thickness of casting speed and band in some possible application;
Fig. 3 is to use the relative liquid metal part curve map over time that sandwiches with surface temperature in one section inside of the band of the inventive method casting.
The specific embodiment
Referring to accompanying drawing, more specifically referring to Fig. 1, the total schematically expression of label 10 is with the continuous casting machine of two rollers 11, and wherein motlten metal 12 is discharged in the gap of the adjustable distance that limits with the relative surface of facing that is poured into by described roller 11 by the proper device (not shown).
In the downstream of roller 11, being provided with common often is the guiding and the pull system of the band roller that cooperates with cooling device.
Owing to cooling system is arranged in the downstream, in the exit of roller 11, obtained coagulation band 15, send to rolling.
In order to remove one section, for example with 15 front end rigion 15a or tail end section, or in order separately to be with 15 at the intermediate point that requires, the invention provides increases casting and shifts out speed, for example from time t
0Beginning, for example nominal value V from beginning
1[to steel, for example being about 40m/min (seeing the electric wire of Fig. 2 a)] is to time t
1, the nominal value V of casting speed
0[, for example being about 52m/min] to steel.The time t that begins to increase in this moment speed
0For example be decided by the length of the tail end band that front end rigion 15a maybe will remove, or be decided by separately to become two sections position with 15a.
The time period that obtaining this speed increases equals t
1-t
0, be generally 50-600ms for steel, for example be about 300ms.
The speed that increases keeps a period of time to t
2, this time period t
2-t
1Preferably very short, for example be about 0 to about 200ms for steel.Under the situation shown in the figure, this time period equals 100ms.
Subsequently, speed reduces again, at time t
3, this speed is got back to the speed V of stable operating mode again
1
In speed from V
1To V
0The situation that increases of speed under, the thickness of retainer belt is stable and equal S
1(for example being about 2.4mm under the situation of steel) solidifies end point 114 to be displaced to a distance segment that is lower than described tie point 14, and this distance segment is by acceleration and decelerating phase, the maximum speed value that reaches and keep stable time period t under the speed of maximum
2-t
1Determine.
This is because whole time period t
3-t
0, comprise and quickening and braking section, between the cooling surface of roller 11 and the time that contacts between accordingly with 15 half top layer 13a, 13b relatively the analog value during stabilized speed reduce therefore corresponding the reducing of concreting thickness of described half top layer 13a, 13b.
When casting speed is got back to original value, the increase that corresponding casting speed is of short duration and being included in tie point 14 and solidifying liquid metal part 16 between the end points 114 of obtaining remains on the inside with 15.
Can see the liquid metal part 16 that is clipped in the inside in the curve map below Fig. 2 a, in this curve map dotted line represent thickness by two and half top layer 13a, 13b lump together obtain with total solid thickness of 15, and solid line is represented the gross thickness with 15.
16 pairs of liquid metal parts roller 11 downstreams with 15 vertical section influential, it can make the top layer of having solidified heat again, can be heated near the temperature of fusion temperature again.
The curve map of Fig. 3 is illustrated in this place, raises suddenly in the outlet of roller 11 corresponding to the surface temperature of the section of the steel band 15 that has the liquid part that sandwiches to water out, and this is to be with 15 because the liquid metal part that produces 16 of gathering way passes to residual heat.This surface temperature almost reaches internal temperature values, just almost arrives the top layer of solidifying that forms before the outlet of roller 11 is got back near liquid condition.
Under this state, the mechanical performance of solidifying part with 15 around liquid metal 16 sharply descends, and feasible weight by the front end rigion 15a that is with can cause is with 15 corresponding to 16 fractures of liquid metal part, so front end rigion 15a natural separation.
Finish when the time period of the casting speed of this increase, this speed turns back to commencing speed, under the situation of steel, is about 40m/min.
According to a modification shown in Fig. 2 b, casting speed at first is reduced to than stable speed V
0Little speed V
1, be increased to speed V subsequently
0The time that keeps a weak point is so that produce the condition of determining to produce the liquid metal part 16 that is involved in as previously described.Carry out the speed V that the decelerating phase makes increase again
0Value not at Tai Gao with make the power of electric motor of casting roll excessively not increase.
Under this situation, because being inversely proportional to 15 the thickness and the exponential function of casting speed of solidifying, under the situation of steel, this index is less than 1, along with speed reduce to cast thickness increase with 15, for example for steel from thickness S
0For about 1.8mm is increased to thickness S
1Be about 2.4mm.
The thickness that obtains by the distance that changes roller 11 increases basicly stable for the cooling condition of retainer belt 15 to be necessary, to make up to time t
0When at this moment speed increased, the curing condition of half top layer 13a, 13b kept corresponding with stable operating mode substantially.
In the corresponding way, if formed in the liquid metal part 16 that sandwiches, we will turn back to higher value V to casting speed
0, and do not have to form the liquid metal part 16 that further is involved in, and as finding out from Fig. 2 b is right-hand, must be the thickness of Cast Strip 15 from S
1Be reduced to S
0, in this case, also revise the gap between the roller 11.
The necessary time interval (t
3-t
0) comprise stage and retention time under gathering way of speedup and deceleration, this time interval will be selected to the feasible weight fracture belt 15 owing to front end rigion 15a of lowest term of liquid metal part 16 formation that are maintained enough under each situation, or tail end section or interlude below disconnecting.
According to the embodiment shown in the curve map of Fig. 2 c and 2d, simply since casting speed from V
1Be increased to V
0Shear.
This speed increase has determined that the identical mode of mode as previously described forms the liquid metal part 16 that sandwiches.But after forming this liquid metal part, casting speed does not turn back to original value, and remains on the speed V of increase
0(Fig. 2 c) down.The velocity amplitude of the increase of this maintenance is accompanied by accordingly with 15 thickness from S
1Be reduced to S
0, make in the downstream of the described liquid metal part 16 that sandwiches, cooling condition, thereby curing condition keeps corresponding with the situation of stable operating mode substantially.This makes and to melt with the solid skin that surrounds the liquid metal part 16 that sandwiches and the weight of band section 15a makes with 15 and shears corresponding to the fracture of described liquid metal part 16 again.
In the application shown in Fig. 2 d, with the identical mode shown in Fig. 2 b, this method provided for first decelerating phase, was accompanied by the corresponding increase with 15 thickness, and is so that determine a low starting velocity, low to enough the speed V that increases
0Value remain on not too high level.
Then quicken under stable thickness after slowing down, it determines to form the liquid metal part 16 that sandwiches.Keep speed again under the speed of this increase, keep the situation of cooling and curing condition and stable operating mode corresponding but thickness reduces in relevant mode.
As mentioned above, also can use this method and come shear band 15, shear and carry out, for example remove the tail end section at any section place that is not front end rigion with same principle and same procedure, or at any interlude shear band 15.
Can make various modifications and/or increase to method of the present invention not deviating under the present invention's spirit scope situation.
Claims (11)
1. when discharging, shears by the casting band method of casting band (15) for one kind from double-roller type continuous casting machine (10), described casting machine comprises at least one pair of casting roll (11), with comprise the cooling device at least that described band (15) is solidified, it is characterized in that described method comprises that corresponding basicly stable speed increases casting speed, under the casting speed that increases, keep a period of time at interval, described increase casting speed be the thickness that keeps described casting band (15) basicly stable with stable speed corresponding thickness value under carry out, so that at least in the section of passing through described cooling device with the speed that increases, the core of the liquid metal part (16) that formation sandwiches in described casting band (15), described liquid metal part (16) make the top layer that is close to it at least melt and disconnect owing to the weight that is positioned at the following casting band portion (15a) of described liquid metal part (16) makes band (15).
2. according to the method for claim 1, it is characterized in that finishing when the time that keeps under the speed of increase, casting speed turns back to stable casting speed and equates.
3. according to the method for claim 2, it is characterized in that casting speed turn back to equate with stable casting speed and finish shearing band (15) after, casting speed increase again and in the corresponding way, reduce the thickness of band (15) so as to obtain with stable operating mode under corresponding, the heat exchange of band (15) of condition and the condition of solidifying.
4. according to the method for claim 1, it is characterized in that after the time of the speed that increases finishes, keep casting speed under the speed of described increase, correspondingly reduce the thickness of casting band (15) in case obtain with stable operating mode under condition accordingly with the heat exchange of (15) and the condition of solidifying.
5. require among the 1-4 each method according to aforesaid right, it is characterized in that before described speed increases, the temporary transient thickness that reduces casting speed and corresponding described speed reduction, increases described band (15), so that obtain with stable operating mode under corresponding, the heat exchange of band (15) of condition and the condition of solidifying, described speed reduces and is used for the power of the motor requirement that restriction cooperates with described roller (11).
6. require among the 1-4 each method according to aforesaid right, it is characterized in that the described time interval is relevant with described band (15) and the metal poured into a mould at least.
7. require among the 1-4 each method according to aforesaid right, it is characterized in that at liquid metal be under the situation of steel, the described time interval is between about 0-200ms.
8. require among the 1-4 each method according to aforesaid right, it is characterized in that at liquid metal be under the situation of steel, casting speed is brought up to the required time that gathers way be about 50-600ms.
9. require among the 1-4 each method according to aforesaid right, it is characterized in that described method is used for removing in cast sections the front end rigion (15a) of band (15).
10. according to each method among the claim 1-4, it is characterized in that described method is used for removing in cast sections the tail end section of band (15).
11., it is characterized in that described method is used at the interlude of emergency situations down cut band (15) or two bands (15) of different-thickness separately, or owing to the production reason is used for two sections of band (15) separately according to each method among the claim 1-4.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITUD2001A000058 | 2001-03-26 | ||
| IT2001UD000058A ITUD20010058A1 (en) | 2001-03-26 | 2001-03-26 | CUTTING PROCEDURE OF A TAPE IN THE CASTING PHASE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1460039A CN1460039A (en) | 2003-12-03 |
| CN1254332C true CN1254332C (en) | 2006-05-03 |
Family
ID=11460552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN02800875.8A Expired - Fee Related CN1254332C (en) | 2001-03-26 | 2002-03-25 | Method to shear strip during casting step |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6915839B2 (en) |
| EP (1) | EP1372890B1 (en) |
| CN (1) | CN1254332C (en) |
| AT (1) | ATE369219T1 (en) |
| DE (1) | DE60221653T2 (en) |
| IT (1) | ITUD20010058A1 (en) |
| WO (1) | WO2002076655A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT411822B (en) † | 2002-09-12 | 2004-06-25 | Voest Alpine Ind Anlagen | METHOD AND DEVICE FOR STARTING A CASTING PROCESS |
| SE527507C2 (en) † | 2004-07-13 | 2006-03-28 | Abb Ab | An apparatus and method for stabilizing a metallic article as well as a use of the apparatus |
| CN100408227C (en) * | 2006-10-31 | 2008-08-06 | 重庆钢铁(集团)有限责任公司 | Automatic billet shearing system for multi-section square billet conticaster |
| CN102294449B (en) * | 2010-06-25 | 2013-06-19 | 宝山钢铁股份有限公司 | Method for active strip breaking and continuous casting keeping of strip continuous casting |
| KR101482461B1 (en) * | 2013-12-20 | 2015-01-13 | 주식회사 포스코 | Strip casting method for manufacturing austenite stainless steel having good edge porperty |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55128354A (en) | 1979-03-29 | 1980-10-04 | Furukawa Electric Co Ltd:The | Cutting method for product at direct rolling |
| JP3007941B2 (en) * | 1991-11-21 | 2000-02-14 | 石川島播磨重工業株式会社 | Metal strip casting method |
| DE4338805C2 (en) * | 1993-11-12 | 1995-10-26 | Schloemann Siemag Ag | Method and device for operating a continuous caster |
| AUPN548295A0 (en) * | 1995-09-19 | 1995-10-12 | Bhp Steel (Jla) Pty Limited | Strip casting |
| DE19840898C2 (en) * | 1998-09-08 | 2000-06-29 | Thyssenkrupp Stahl Ag | Process for producing load-optimized steel strips |
-
2001
- 2001-03-26 IT IT2001UD000058A patent/ITUD20010058A1/en unknown
-
2002
- 2002-03-25 CN CN02800875.8A patent/CN1254332C/en not_active Expired - Fee Related
- 2002-03-25 WO PCT/IB2002/000888 patent/WO2002076655A1/en active IP Right Grant
- 2002-03-25 US US10/472,515 patent/US6915839B2/en not_active Expired - Fee Related
- 2002-03-25 AT AT02714374T patent/ATE369219T1/en not_active IP Right Cessation
- 2002-03-25 DE DE60221653T patent/DE60221653T2/en not_active Expired - Lifetime
- 2002-03-25 EP EP02714374A patent/EP1372890B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| ATE369219T1 (en) | 2007-08-15 |
| DE60221653D1 (en) | 2007-09-20 |
| EP1372890B1 (en) | 2007-08-08 |
| WO2002076655A1 (en) | 2002-10-03 |
| ITUD20010058A1 (en) | 2002-09-26 |
| US20040104006A1 (en) | 2004-06-03 |
| DE60221653T2 (en) | 2008-05-21 |
| US6915839B2 (en) | 2005-07-12 |
| CN1460039A (en) | 2003-12-03 |
| EP1372890A1 (en) | 2004-01-02 |
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Granted publication date: 20060503 Termination date: 20200325 |